Increased power and rear end

[mantis]

How much horse power can the rear end of the 240sx handle. I have not seen anyone changing their rear end at all. A stock LS1 should be pushing at least 325 horse power, and a lot more with a few upgrades. What would happen if you ran slicks that really hooked up with a 400 horse power 240sx? Will the rear end hold up, or does it need to be changed out?

[Fla240sx]

itshould hold

[cnichols]

Axles will go first.

[S13FX]

And when that axle snaps when your going fast it's the scariest thing alive.

Don't ask me how I know heh.

[Fla240sx]

isn't there a write-up somewhere about using a Q45 diff with its stronger axles?

[mantis]

How much power can we expect the stock rear end and axles to withstand? I am thinking of doing an LS1 swap that should end up around 420 HP. I need to be able to be a daily driver though. I had considered throwing a camaro rear end in, but don't want to if I don't have to. The car really won't be raced hard. Maybe run in the 1/4 a few times, then driven for fun.

[mig240sx]

It should hold up, but it won't last as long (depending how often you floor it). Like cnichols said, the axles will go first. I won't concern myself with how much hp the rear end will hold, the real question you should be asking is how much torque can it handle? Torque is what breaks stuff, not the hp (at least off the line and with good tires). If you were to use street tires and/or drag radials, your tires will give before your axles or rear end goes. But you want to run slicks!

Since you want your car to be a daily driver, I would just buy the upgraded rear end and axles so if it were to eventually go, you would have your car up and running fast (instead of having to find the parts later with no car).

I recommend, keep your torque under 400 and your hp under 500 and you should be ok. With a light car, you won't need that much torque or you will be spining like crazy when your not on slicks (daily driving). That's how I'm setting up my daily driving beast.
Modified by mig240sx at 11:37 AM 11/4/2007

[OutToWinPAHC]

isn't there a write-up somewhere about using a Q45 diff with its stronger axles?

Yeah its a simple thing to do you just need the Q45 rear with one Z32TT axle, and a Q45 Axel for the lengths, they are much beefier then the 240 and J30's. Its still a R200 rear internally, but I packed mine with Cusco gears. Iv done a few hard launches, its not going anywhere.

Just seach the transmission and rear section

[Fla240sx]

sounds nice OuttoWin

LOL @ put a camaro rear end in.........

I'm sure those are weaker.... people break those with STOCK f bodies and 6 speeds

[Blown240sx]

Im driving around right now putting down 400 whp on stock axels and no issues so far. Although traction isnt there in 1st or 2nd so it helps.

[WDRacing]

The R200 is being used in Ivans drag car. He is pushing about 1000hp, runs 9's @ 160ish. So you're more then good with the R200 and axels. He launches at 6500 or so through a stalled TH350 IIRC.

[radianation]

This is great information to know. I'm looking at around 550whp with my new RB25DET setup and I started wondering about the rear end... Doh!

Btw I have the 96 S14 240sx SE w/LSD and my ABS is disabled. Not sure if I need to do any mods here or what the best option would be. I think the technical article I read is more for pros/cons LSD than high hp rear end. So my question is, will the LSD rear end I have take any additional torque/hp or is it pretty much 400/500 like stated above?

[WDRacing]

Read my post, the R200 has been used in drag cars running slicks for years now with NO issues. Most of these cars are running over 500WHP and launching at high rev limits on full boost. In everything from a 240 to the 300zx, the R200 is a stout piece.

[radianation]

Ok.

[mantis]

I hear really different things regarding this topic. I have heard some say they have snapped the axles, and others say they will work fine. Very interesting.

[radianation]

I still can't find information about the 240sx axle and I don't really see any aftermarket options.
Modified by radianation at 11:42 PM 11/4/2007

[cnichols]

The diff itself is the R200/R200V. You really don't have to worry about it breaking.

The axles however can break with big power and sticky tires. Just buy a backup set and go at it. If you keep breaking them, then look into aftermarket ones. Until then, worry about actually making the power first. Most likely, other things are going to break first like your transmission.

[WDRacing]

The diff itself is the R200/R200V. You really don't have to worry about it breaking.

The axles however can break with big power and sticky tires. Just buy a backup set and go at it. If you keep breaking them, then look into aftermarket ones. Until then, worry about actually making the power first. Most likely, other things are going to break first like your transmission.

Couldn't have said it better myself. Every instance will be different. The guys breaking axels are probably launching extremely hard with slicks. Or the axels have just been abused for years...remember most of these cars are over 100K. Break them, then worry.

[rb25drag]

I know this is an OLD topic. But I have the R200 in my 1990 240sx With a Rb25det and I Snapped Both Axles last race season On my launch of course I launched Very hard at 6400RPMS. I replaced them with a Set of Stock ones. But how reliable is this going to be? B/C I just Snapped my Driveshaft this past weekend at the track. Im worried about killing these axles again when I get my new shaft made.

I killed my Driveshaft with a 3600RPM launch @ 5psi of boost with a launch controller and a set of 11.50x26x17 Mt Et drag radials.

The only set of axles im finding is from the Driveshaft shop and there 699$ for a set. Which I thought was high.